Air intake muffler and connecting base assembly
By combining the design of the muffler, the problems of fixed acoustic parameters and water accumulation blockage in the heavy truck intake muffler are solved, enabling flexible adjustment and improving sealing reliability, thus ensuring long-term noise reduction performance and overall vehicle acoustic quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHANDONG SHUIXING BO HUI CAR COMPONENT CO LTD
- Filing Date
- 2026-05-07
- Publication Date
- 2026-06-05
AI Technical Summary
Existing heavy-duty truck intake mufflers are difficult to adjust acoustic parameters flexibly, are prone to water accumulation and blockage, and the interfaces fail and leak air under severe vibration, affecting noise reduction performance and overall vehicle reliability.
Designed as a modular assembly structure, the silencing mechanism includes a silencing pipe, a partition, and a sealing gasket ring. The interface is fixed with sealant and rivets. The bellows absorbs vibration, and the silencing holes are arranged upwards to reduce water accumulation. The partition separates independent silencing chambers to adapt to different frequency noise reduction requirements.
It enables flexible adjustment and improved versatility of the muffler, prevents water accumulation and blockage, enhances sealing reliability, reduces manufacturing costs, and ensures long-term noise reduction performance and overall vehicle acoustic quality.
Smart Images
Figure CN122148460A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of automotive intake system technology, specifically to an intake muffler and connecting base assembly. Background Technology
[0002] With the continuous development of heavy-duty truck engine technology, the intake volume is increasing day by day, and the resulting intake noise is characterized by high sound level and wide frequency band. As an important component of the heavy-duty truck intake system, the intake muffler needs to meet the stringent noise reduction requirements. Most existing heavy-duty truck intake mufflers adopt an integral structure. The internal silencing chamber and pipeline are usually solidified by hot plate welding or vibration friction welding. This integrated molding method makes the internal acoustic parameters of the muffler fixed, making it difficult to flexibly adjust for different displacement models or different vehicle models. When facing noise reduction requirements in different frequency bands, it is often necessary to redesign the entire muffler body by opening a new mold. This not only results in a long development cycle and high manufacturing cost, but also makes it difficult to achieve the universalization of internal components.
[0003] Heavy trucks operate in harsh environments. In rainy, snowy, or high-humidity conditions, the intake pipes can absorb moisture, which can accumulate inside the muffler. Existing muffler structures lack specific anti-water-accumulation designs, and the internal connecting pores can become clogged by the accumulated liquid, leading to a decrease in noise reduction performance. Long-term liquid accumulation can also cause corrosion of the internal structure. In addition, heavy trucks experience severe chassis vibration during operation, and there are significant relative displacements and assembly tolerances between the various intake pipes. Existing mufflers generally use rigid connections or simple clamps for fixing when connecting to the intake duct and air filter pipe. Under long-term vibration and alternating loads, local stress concentration can occur, leading to interface seal failure or breakage, which in turn causes air leakage and noise leakage, affecting the overall acoustic quality of the vehicle and the operational reliability of the engine. Summary of the Invention
[0004] To address the shortcomings of existing technologies, this invention provides an intake muffler and connecting base assembly, which solves the problems of difficult chamber fixing, internal blockage and water accumulation, and interface failure and air leakage under severe vibration in existing heavy truck intake mufflers.
[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: an intake muffler and a connecting base assembly, including an intake duct and an air filter pipe, wherein a muffler mechanism is provided between the intake duct and the air filter pipe, and the muffler mechanism is used to meet the noise reduction requirements of different frequencies; The silencing mechanism includes an upper cavity cover, which is disposed between the air intake duct and the air filter tube. A base cover is bolted to the bottom of the upper cavity cover, and a silencing tube is bolted to the inner side of the base cover. Multiple baffles are provided on the outer side of the silencing tube, and the baffles and the silencing tube are connected by assembly. A sealing gasket is fitted on the outer side of the base cover, and the sealing gasket is respectively fitted between the upper cavity cover and the base cover. Multiple silencing holes are opened on the outer side of the silencing tube, and the silencing holes are arranged upward. A corrugated pipe is connected to the middle of the air filter tube. The air intake duct is fitted on one end of the upper cavity cover, and the air filter tube is fitted on one end of the base cover.
[0006] Preferably, the inner side of the upper cavity cover is provided with multiple limiting grooves II, the inner side of the base cover is provided with a locking groove, and the outer side of the silencer tube is provided with a limiting groove I. The limiting groove I, limiting groove II and locking groove cooperate with each other for positioning.
[0007] Preferably, an interceptor cover is fixedly connected to the top of the air intake duct.
[0008] Preferably, the partition is an independent injection molded part, and the silencer pipe, the partition, and the silencer hole together constitute a combined silencer structure.
[0009] Preferably, the upper cavity cover and the base cover are sealed by the sealing gasket ring, and the upper cavity cover and the lower base cover together form an internal sound-absorbing closed cavity.
[0010] Preferably, the sealing gasket ring is clamped between the mating end faces of the upper cavity cover and the base cover, and forms an end face sealing structure between the upper cavity cover and the base cover.
[0011] Preferably, the silencing holes are arranged upwards and are evenly distributed on the outer side wall of the silencing pipe.
[0012] Preferably, the interface between the air intake duct and the muffler mechanism is fixed with sealant and rivets, and the interface between the air filter pipe and the muffler mechanism is also fixed with sealant and rivets.
[0013] Preferably, the multiple baffles are distributed sequentially along the axial direction of the silencer pipe, and divide the interior of the silencer mechanism into multiple independent silencer chambers.
[0014] This invention provides an intake muffler and a connecting base assembly. It has the following beneficial effects: 1. The present invention designs the silencing mechanism as a modular assembly structure. By assembling multiple independently injection-molded baffles on the outside of the silencing pipe, the interior is divided into multiple independent silencing chambers. This structure allows for flexible adjustment of the spacing and number of baffles to change the silencing parameters according to the noise reduction requirements of heavy trucks with different displacements, thereby achieving targeted elimination of noise at different frequencies. At the same time, it improves the versatility of parts and reduces mold opening and manufacturing costs. 2. In this invention, multiple silencing holes on the outer wall of the silencer are arranged upwards. When heavy trucks operate under high humidity conditions such as rain and snow and the intake airflow carries moisture, the upward arrangement of the holes can reduce the retention and accumulation of liquid in the silencing holes, prevent the pores from being blocked by water accumulation, and thus ensure the stability of the acoustic noise reduction performance of the silencer during long-term operation. 3. The present invention has a corrugated pipe connected in the middle of the air filter pipe, and uses sealant and rivets to fix the interface between the air intake, the air filter pipe and the muffler mechanism. The corrugated pipe structure can effectively absorb the severe vibration generated during the heavy truck's operation and compensate for the assembly deviation between the pipes. With the tight and sealed interface design, it avoids cracking and air leakage at the connection due to long-term alternating stress, thus improving the sealing reliability of the overall system. Attached Figure Description
[0015] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the bellows structure of the present invention; Figure 3 This is an exploded view of the present invention; Figure 4 This is an exploded view of the noise reduction mechanism of the present invention; Figure 5 This is a schematic diagram of the structure of the base cover of the present invention; Figure 6 This is a schematic diagram of the silencer pipe of the present invention; Figure 7 This is a schematic diagram of the upper cavity cover of the present invention; Figure 8 This is a schematic diagram of the base cover of the present invention.
[0016] Among them, 1. Inlet duct; 2. Muffler mechanism; 21. Upper cavity cover; 22. Base cover; 23. Muffler pipe; 24. Partition plate; 25. Sealing gasket ring; 26. Muffler hole; 27. Limiting groove one; 28. Limiting groove two; 29. Engaging groove; 3. Air filter pipe; 4. Corrugated pipe; 5. Interceptor cover. Detailed Implementation
[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0018] Please see the appendix Figure 1 - Appendix Figure 8 The present invention provides an intake muffler and a connecting base assembly, including an intake duct 1 and an air filter pipe 3. A muffler 2 is provided between the intake duct 1 and the air filter pipe 3. The muffler 2 is used to meet the noise reduction requirements of different frequencies. The silencer mechanism 2 includes an upper cavity cover 21, which is located between the air intake duct 1 and the air filter pipe 3. The bottom of the upper cavity cover 21 is bolted to a base cover 22, and the inner side of the base cover 22 is bolted to a silencer pipe 23. Multiple baffles 24 are provided on the outer side of the silencer pipe 23. The baffles 24 and the silencer pipe 23 are connected by assembly. A sealing gasket 25 is sleeved on the outer side of the base cover 22. The sealing gasket 25 is respectively sleeved between the upper cavity cover 21 and the base cover 22. Multiple silencer holes 26 are opened on the outer side of the silencer pipe 23. The silencer holes 26 are arranged upward. A corrugated pipe 4 is connected to the middle of the air filter pipe 3. The air intake duct 1 is fitted onto one end of the upper cavity cover 21, and the air filter tube 3 is fitted onto one end of the base cover 22. Multiple limiting grooves 28 are provided on the inner side of the upper cavity cover 21, and a locking groove 29 is provided on the inner side of the base cover 22. A limiting groove 27 is provided on the outer side of the silencer pipe 23. The limiting groove 27, the limiting groove 28 and the locking groove 29 cooperate with each other for positioning. An interceptor cover 5 is fixedly connected to the top of the air intake duct 1; Specifically, the intake duct 1 and the air filter pipe 3 are arranged adjacent to each other, and a silencer mechanism 2 is set between them. The silencer mechanism 2 is an integrated structure that, while realizing the airflow delivery function, constitutes a multi-band silencer carrier. The silencer mechanism 2 includes an upper cavity cover 21, which is located between the intake duct 1 and the air filter pipe 3, and together with the lower base cover 22, forms an internal silencer cavity. The bottom of the upper cavity cover 21 is fastened to the base cover 22 with bolts, and the joint between the two is not welded by hot plate or vibration friction welding. A sealing gasket 25 is fitted on the outside of the base cover 22. The sealing gasket 25 is an elastic sealing component that is clamped between the mating end faces of the upper cavity cover 21 and the base cover 22 to form a sealed mating structure. The inside of the base cover 22 is fixedly connected to the silencer pipe 23 with bolts. The silencer pipe 23 is arranged along the airflow direction to provide a main flow channel for the airflow. Multiple baffles 24 are provided on the outer side of the silencer pipe 23. The baffles 24 are independent injection-molded components. Each baffle 24 is assembled and fixed to the silencer pipe 23. They are distributed sequentially along the axial direction of the silencer pipe 23, dividing the interior of the silencer mechanism 2 into multiple independent silencer chambers. Each chamber can be set with different silencer parameters to adapt to the noise treatment requirements of different frequency bands. Multiple silencer holes 26 are opened on the outer wall of the silencer pipe 23. The silencer holes 26 penetrate the pipe wall of the silencer pipe 23 and are arranged upward as a whole to reduce liquid retention in the holes. The air inlet duct 1 is sleeved on one side of the upper cavity cover 21, and the air filter pipe 3 is sleeved on one side of the base cover 22. The interface positions of the air inlet duct 1, the air filter pipe 3 and the silencer mechanism 2 are fixed with sealant and rivets to form a reliable connection structure. The silencing mechanism 2 is a universal component structure. The main components can be universally adapted to the assembly boundary conditions of different displacement engine models and different vehicle models. By adjusting the size of the internal silencing components, the corresponding noise spectrum processing requirements can be matched. Multiple limiting grooves 28 are opened on the inner side of the upper cavity cover 21, and a locking groove 29 is opened on the inner side of the base cover 22. A limiting groove 27 is opened on the outer side of the silencing pipe 23. The limiting grooves 27, 28 and 29 cooperate with each other to realize the positioning and assembly between the silencing pipe 23, the partition 24 and the base cover 22 and the upper cavity cover 21, ensuring the stability of the internal component assembly position and improving the overall structural consistency.
[0019] See appendix Figure 4 - Appendix Figure 8 The partition 24 is an independent injection molded part. The silencer pipe 23, the partition 24, and the silencer holes 26 together form a combined silencer structure. The upper cavity cover 21 and the base cover 22 are sealed by a sealing gasket 25, and the upper cavity cover 21 and the lower base cover 22 together form an internal silencer closed cavity. The sealing gasket 25 is clamped between the mating end faces of the upper cavity cover 21 and the base cover 22, and an end face sealing structure is formed between the upper cavity cover 21 and the base cover 22. The silencer holes 26 are evenly distributed on the outer side wall of the silencer pipe 23. The interface between the air intake duct 1 and the silencer mechanism 2 is fixed with sealant and rivets, and the interface between the air filter pipe 3 and the silencer mechanism 2 is also fixed with sealant and rivets. Multiple partitions 24 are distributed sequentially along the axial direction of the silencer pipe 23, and divide the interior of the silencer mechanism 2 into multiple independent silencer chambers. Specifically, an interceptor cover 5 is provided at the top of the air intake duct 1. The interceptor cover 5 is fixedly connected to the air intake duct 1 and is used to shield and protect the end of the air intake duct 1. A corrugated pipe 4 is provided in the middle of the air filter pipe 3. The corrugated pipe 4 is connected to the air filter pipe 3 to form a flexible connection structure that can adapt to assembly deviations and vibration displacements. The silencing mechanism 2 adopts a combined structural design. It consists of a silencing pipe 23, a baffle 24, and a silencing hole 26, which together form a multi-unit combined silencing structure. Each unit cooperates with the others to form a complete silencing system. The partition 24 is made by independent injection molding process and is an independently processed structural component. The partition 24 and the silencer pipe 23 are connected by assembly method to realize separate processing and overall assembly. The upper cavity cover 21 and the base cover 22 are sealed by sealing gasket 25. The sealing gasket 25 is an elastic sealing ring. The elastic sealing ring is clamped between the mating end faces of the upper cavity cover 21 and the base cover 22 to form an end face sealing structure. The upper cavity cover 21 and the base cover 22 are locked together with bolts, replacing the welding connection method and realizing detachable assembly; multiple silencing holes 26 are opened on the outer wall of the silencer pipe 23. The silencing holes 26 are evenly distributed along the pipe wall and are arranged upward as a whole to reduce the accumulation of liquid in the holes; the silencer mechanism 2 adopts a universal component structure design. The interface between the air inlet duct 1, the air filter pipe 3 and the silencer mechanism 2 is fixed by a combination of sealant and rivets to improve the sealing performance and structural stability of the interface connection.
[0020] Working principle: When the device is working, external air enters the inlet duct 1. The interceptor cover 5 at the top of the inlet duct 1 initially guides the airflow and blocks debris, so that the airflow enters the silencer mechanism 2 smoothly. After the airflow enters the silencer mechanism 2, it continues to flow along the axial direction of the silencer pipe 23. The silencer pipe 23 serves as the main channel to provide a stable flow path for the air intake. As airflow passes through the muffler 23, noises of different frequencies generated by the engine and the vehicle propagate synchronously with the airflow. The noise enters the independent silencing chambers formed by multiple baffles 24 through the evenly distributed and upward-arranged silencing holes 26 on the side wall of the muffler 23. Each independently injection-molded baffle 24 is arranged along the axial direction of the muffler 23, dividing the internal space into multiple independent cavities. Different cavities correspond to different silencing parameters, and perform propagation attenuation, reflection dissipation, and energy absorption on noises of different frequencies respectively, achieving wide-range noise treatment. The upper cavity cover 21 and the base cover 22 of the silencing mechanism 2 are tightly sealed by an elastic sealing ring and locked by bolts to form a complete closed cavity, preventing airflow leakage and noise radiation. After the silencing treatment is completed, the airflow continues to flow out along the silencing pipe 23 and enters the air filter pipe 3; the corrugated pipe 4 in the middle of the air filter pipe 3 absorbs the vibration during operation and adapts to assembly deviations, ensuring continuous and stable airflow delivery. Furthermore, the interfaces between the air intake duct 1, the air filter pipe 3, and the muffler mechanism 2 are secured with sealant and rivets, improving overall sealing performance and structural stability. The muffler holes 26 are arranged upwards, reducing liquid retention within the holes, and, in conjunction with the internal structural layout, allowing any small amount of accumulated liquid to drain naturally. This device, while fulfilling the vehicle's air intake function, also performs comprehensive noise reduction across multiple frequency bands, adapting to the needs of various engine and vehicle models.
[0021] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. An intake muffler and connecting base assembly, comprising an intake duct (1) and an air filter pipe (3), characterized in that, A silencing mechanism (2) is provided between the air inlet (1) and the air filter (3) adjacent to each other. The silencing mechanism (2) is used to meet the noise reduction requirements of different frequencies. The silencing mechanism (2) includes an upper cavity cover (21), which is located between the air inlet (1) and the air filter pipe (3). The bottom of the upper cavity cover (21) is bolted to a base cover (22), and the inner side of the base cover (22) is bolted to a silencing pipe (23). Multiple partitions (24) are provided on the outer side of the silencing pipe (23). The partitions (24) and the silencing pipe (23) are connected by assembly. A sealing gasket (25) is sleeved on the outer side of the base cover (22). The sealing gasket (25) is respectively sleeved between the upper cavity cover (21) and the base cover (22). Multiple silencing holes (26) are opened on the outer side of the silencing pipe (23). The silencing holes (26) are arranged upward. A corrugated pipe (4) is connected to the middle of the air filter pipe (3). The air inlet (1) is fitted onto one side of the upper cavity cover (21), and the air filter tube (3) is fitted onto one side of the base cover (22).
2. The intake muffler and connecting base assembly according to claim 1, characterized in that, The inner side of the upper cavity cover (21) is provided with multiple limiting grooves (28), the inner side of the base cover (22) is provided with a locking groove (29), and the outer side of the silencer pipe (23) is provided with a limiting groove (27). The limiting groove (27), the limiting groove (28), and the locking groove (29) cooperate with each other for positioning.
3. The intake muffler and connecting base assembly according to claim 1, characterized in that, An interceptor cover (5) is fixedly connected to the top of the air inlet (1).
4. The intake muffler and connecting base assembly according to claim 1, characterized in that, The partition (24) is an independent injection molded part, and the silencer pipe (23), the partition (24) and the silencer hole (26) together constitute a combined silencer structure.
5. The intake muffler and connecting base assembly according to claim 1, characterized in that, The upper cavity cover (21) and the base cover (22) are sealed together by the sealing gasket ring (25), and the upper cavity cover (21) and the lower base cover (22) together form an internal sound-absorbing closed cavity.
6. The intake muffler and connecting base assembly according to claim 5, characterized in that, The sealing ring (25) is clamped between the mating end faces of the upper cavity cover (21) and the base cover (22), and forms an end face sealing structure between the upper cavity cover (21) and the base cover (22).
7. The intake muffler and connecting base assembly according to claim 1, characterized in that, The silencing holes (26) are evenly distributed on the outer wall of the silencing pipe (23).
8. The intake muffler and connecting base assembly according to claim 1, characterized in that, The interface between the air intake (1) and the muffler (2) is fixed with sealant and rivets, and the interface between the air filter pipe (3) and the muffler (2) is also fixed with sealant and rivets.
9. The intake muffler and connecting base assembly according to claim 1, characterized in that, Multiple partitions (24) are distributed sequentially along the axial direction of the silencer pipe (23), and divide the interior of the silencer mechanism (2) into multiple independent silencer chambers.